Improvement in harvester-knife sharpeners



. 2 Sheets-Shed J. CONNEL.- Harvester Knife-Sharpener.

No. 210,011. Patented Nov. 19, 187,8'.

2 sheens-sneet 2.

,1.1/110011111311.` Harvester vKni-fefSharpener.

No. 210,011.v Patefnfed'Nov. 19,1878.

ATTRg Evs N,PETER, PHOTO-LITHUGHPHR. WASHINGTON, DA c,

raras PATENT r JAMEs M. coNNnL, or NEWARK, omo.l

IMPROVEMENT IN HARVESTER-KNIFE SHARPENERS.

Specification forming part of Letters Patent No. 210,011,` datedNovember 19, 1878; application filed October I21, 1878.

for grinding harvester-knives, as will be hereinafter more fully setforth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawings, in which-Figure l is a side elevation of my machine. Fig. 2 is a plan view of thesame. Fig. 3 is a detailed section of a part thereof.

A represents the platform of the machine, upon which is a stationaryhead-block, B, and upon this hea-dblock is pivoted a movable orvibrating head-rest plate, C, by means of a central bolt, a, connectingthe two together; and the harvester-knives to be ground are applied tosaid headrest, so that by a movement of said plate any angle may beobtained for` the purposes hereinafter explained. D represents thestandard or upright portion of the machine, formed at its .upper endwith a horizontal arm, D1, having a longitudinal slot, as shown, andbelow said arm D1 is another arm, D2, parallel to the base, for thepurpose of supporting the sliding armG, the upper end of which is heldby a bolt, b, in the slotted arm DI.

Upon one end of the bolt b is mounted the driving-wheel E, which, byfriction, cogs, or other means, drives a wheel, H, mounted on a shaftpassing through the sliding arm G. Upon this shaft is also secured apulley, I, conj nected by a belt or cord, e, with a pulley, J,

on a shaft in the lower end of the arm Gr, and upon this latter shaft isalso secured the emerywheel L.

At a ixed point on the arm G is situated a cylindrical projection, d,and a follower, k, is inserted and held therein by an adjustingscrew, h,which, passes (through an elastic cushion, t', in the cylinder above thefollower. Thus an elastic compress is effected, so that a contraction orexpansion thereafter may be effected by the adjustment of said screw,and thus depress or elevate the outer end of the arm on which theemery-wheel L is attached.

On the movable plate C is the seat or rest for the harvesting-knife barand knives, and when suitably applied any desired angle may be obtained,sothat the edgeto be ground rests directly parallel with the arm D2.Thus when power is applied-to the machine a rotary and vibratory mot-ionis imparted to the emery-wheel over the edge of the knife, and it isthereby made to assume a corresponding plane with said arm D2. Theelastic cushion is subject to pressure from automatic causes.

It will readily be 'seen that the centrifugal force of the driving-wheelE is imparted in a downward direction on the wheel H in contacttherewith.

Should there be a depression in the edge of the knife being ground, theoperators hand naturally resting on the knob G of said arm, a greaterdegree of pressure may readily be applied, thus grinding anyirregularity as well as conductingthe arin'in a reciprocating manner.

As soon as the grinding of the knife is completed al relaxation of themotion of the maA chine eausesva corresponding release of the elasticcushion within its cylinder, thereby eil fecting an adjustment of theemery-wheel, so that the knives to be ground may be moved forward orbackward without coming in contact with the emerywhcel, thus avoidingall undue movement of the same.

In the upper edge of the arm D2 is a longia tudinal groove, x, having acorresponding con* cave to that of the convex point of the plun ger orfollower k, which has for its object to so guide the inner end' of thearm that there will be no undue impingement between it and the standard,and also prevent any undue lateral movement of the emery-wheel while inmotion.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. The standard D, provided with the arms D1 and D2, in combination withthe sliding 3. The arm D2, having concave groove, in combination withthe plunger 7c and cushion 45, in the sliding arm G, for the purposesset forth.

In testimony that I claim the foregoing I have hereunto set my hand this22d day of August, 1877.

JAS. M. CONNEL.

Witnesses:

GEO. M. GRAYSEN, JOHN DAVID J ONES.

